
3: POLY(ARYLENE-V INYLENE)S 85
montmorillonite. However, in the exfoliated structure,
two-dimensionalnanospaces willno longer be present.
Intercalation refers to the inclusion of molecules
between the l ayers. Exfoliation refers to the separa-
tion of the layers. In other words, intercalated poly-
mer chains are sandwiched in between clay layers. In
exfoliated nanocomposites the individual layers are
separated, and somewhat uniformly dispersed in the
polymeric matrix. This class of materials has been
widely investigated because of their unique properties
[117]. The efficiency of PPV-related electrolumines-
cent devices is summarized in Table 3.5.
Luminescent ...